Background: Nutrition nurses are clinical nurse specialists with knowledge and experience in nutrition support. We aimed to investigate the nutrition and growth outcomes after employment of a nutrition nurse in our level III neonatal intensive care unit (NICU). Methods: A retrospective cohort study including preterm neonates < 34 weeks and < 2000 g were conducted. Nutrition and growth outcomes of infants in pre-nutrition-nurse and post-nutrition-nurse periods were compared. Primary outcome was presence of postnatal growth retardation (PGR) at term-equivalent age (body weight < 10 percentile at 40 weeks postmenstrual age). Results: Infants in pre-nutrition-nurse (n = 38) and post-nutrition-nurse (n = 40) periods were similar with regard to gestational age, birth weight, gender, and perinatal characteristics. The initiation of parenteral nutrition after admission to NICU (30.8 ± 24.1 vs 6.7 ± 7.6 hours, P < 0,001) and attainment of full enteral feedings (27.3 ±18.1 vs 18.7 ± 11.3 days, P = 0.034) were earlier in post-nutrition-nurse period. First feeds were more commonly started with breast milk (29% vs 75%, P < 0.001); breastfeeding was more common at discharge (79% vs 95%, P = 0.045) and longer in duration (6.1 ± 7.3 vs 8.4 ± 6.3 months, P = 0.008) in postnutrition-nurse period. Primary outcome PGR at term-equivalent age was lower in post-nutrition-nurse period (57.9% vs 27.5%, P = 0.007). Conclusion: Employing a nutrition nurse improved quality of nutrition support, increased breastfeeding, and decreased PGR in preterm neonates. Further prospective evaluation of outcomes in the presence of a nutrition nurse is needed to generalize these findings to other NICUs. (Nutr Clin Pract. 2019;34:616-622)